When applying for a UK visa, how old should the bank statement be?
The guidance says they should not be more than a year old. Ideally, you'll show several months of statements, so by definition most of them will be more than a month old.
See https://www.gov.uk/government/publications/visitor-visa-guide-to-supporting-documents:
Section 4: documents you should not send unless specifically requested
This page provides guidance on the types of documents that are not required to consider your application.
if you are applying as a family/group you do not need to provide multiple copies of the same documents
bank statements or letters issued more than 1 year before the date of application
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1@Adil comments are not used for thanks, if you want to say thanks, please do it in the way the site describes! Please read stackoverflow.com/help/someone-answers – Gayot Fow May 24 '16 at 10:03